edison



(No Model.) 2 Sheets-Sheet 1.

T. A. EDISON.

DYNAMO ELECTRIC MACHINE.

Patented Oct. 30, 1883.

7 INVENTOR:

(No Model.) 7 2 Sheets-Sheet 2. TgA. EDISON.

DYNAMO ELECTRIC MACHINE. No. 287,512. Patented Oct. 30, 1883.

ATTEST:

. INJENTUR! N. PETERS. Phnmhthographu WJShmu'ulL n c.

UNITE STATES PATENT OFFICEC THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY.

DYNAMO ELECTRlC MACHINE.

SPECIFICATION forming part of Letters Patent No. 287,512, dated October30, 1883.

Application filed June .29, 1883. (No model.)

To aZZ whom it may concern.-

Be it known that I, Tnoams A. EDISON, of Menlo Park, in the county ofMiddlesex and State of New Jersey, have invented a new and usefulImprovement in Dynamo-Electric Machines, (Case No. 57 7 of which thefollowing is a specification.

This invention relates to the bed-plates 011 which dynamo-electricmachines are mounted, its object being to maintain a circulation of airabout the armature and between the armature and pole pieces of themachine, whereby undue heating of the armature is prevented; and Iaccomplish this object by providing openings in the bed-plate upon whichthe machine rests, which openings permit air to penetrate to the spacebetween the polar extensions in which the armature revolves. Thebedplate is preferably of iron, having a smaller plate of non-magneticmaterial, preferably zinc, placed upon it, to separate it from themagnet-poles. Both plates are made in the form of ribbed frames, thebed-plate being mounted upon ways, so that the air penetrates under itand through it and the zinc plate to the armature and polar extensions.Both plates are made of as open a form as is consistent with the properdegree of strength.

The invention is illustrated in the annexed drawings, in which- Figure 1is an elevation of a dynamo-electric machine with the bed-plates inlongitudinal vertical section; Fig. 2, a vertical transverse section ofthe plates; Fig. 3, a plan view of the zinc plate, and Fig. 4 a planview of the iron bedplate.

A A are the polar extensions of the fieldmagnet of the machine, betweenwhich the armature B revolves in the direction shown by arrow a.

O is the zinc plate or frame, whose lower edge, I), rests upon the ironbed-plate D. The polar extensions A A rest upon the zinc plate 0, whoseupper edge is provided with apertures c 0'.

The plate D is set upon ways E E, (whereby it may be moved to tightenthe belt connecting it with the source of power, as set .forth inanother application made by 111e,)

The lower bed-plate, D, is provided with oil-receptacles m m, to whichthe oil is conveyed from the bearings. This feature will, however, beincluded in another application.

The arrows in Figs. 1 and 2 show the air circulation when the armatureis revolving in the direction indicated. Air will enter below the plateD and pass through both plates to the armature, as shown by arrow d. Itwill enter, also, as shown by arrows c, at the top of the plate D,passing down, and then up through the center of the plate to thearmature; and, also, the air will pass to and around the armaturethrough the apertures c at the top of the zinc plate, as shown by arrowsf.

It is to be understood that all patentablc features of invention shownor described, but not claimed herein, are reserved for protection byother patents, and have been or will be included in other applicationsfor patents.

That I claim is- 1.. The combination, with a dynamo-electric machine, ofan open bed-plate therefor, through which air penetrates to the spacebetween the polar extensions "of the machine in which the armaturerevolves, substantially as set forth.

2. The combination, with a dynamo-electric machine, of a bed-plateprovided with openings and mounted upon ways, substan tially as setforth.

3. The combination, with a dynamo-elee tric machine, of an open ironbed-plate and an open non-magnetic plate between said iron plate and thefield-magnet of the machine, substantially as set forth.

4. The non-magnetic plate provided with apertures in its upper edges foradmitting air to the armatures, substantially as set forth.

5. The combination, with a dynamo-electrio machine, of a bed-platetherefor, formed This specification signed and witnessed this as aribbed frame, and mounted, upon ways, 25th day of June, 1883.substantially as set forth.

6. The combination, with a dynamo-eleo- THOS. A. EDISON. 5 trio machine,of a non-magnetic plate placed between the polar extensions of themachine \Vitnesses: and the ironbed-plate, andformed asa ribbed H. \V.SEELEY, frame, substantially as set forth. EDWARD H; PYATT.

